Author(s):

Siddharth Panda, Mruthunjaya C Wali, RM Kachapur and SI Harlapur

Abstract: Turcicum Leaf Blight (TLB) caused by Exserohilum turcicum is a major foliar disease of maize in Karnataka with yield losses upto 70% under severe cases. In the context of developing tolerant genotypes against this disease an experiment was conducted using 16 CIMMYT and IIMR germplasm lines selected based on their test weight and per se performance and were crossed with 3 testers (CM-111,CM-500 & PA-15) to produce 48 experimental hybrids in Line X Tester design. These hybrids along with the parents were sown in Kharif 2016 at Main Agricultural Research Station (MARS), UAS, Dharwad to study the disease reaction against TLB. Scoring was done using 1 to 5 scale (Payak & Sharma, 1983), where 1 being highly resistant and 5 being highly susceptible. The performance of these lines and hybrids were compared with the resistant check CI-4 and susceptible check CM-202. Artificial inoculation was done in the leaf whorls with grounded TLB infected leaves at 45 days after sowing and were scored at silk drying stage. Hybrids GH-1518, GH-1523 and lines P-4,P-5,P-6 were found to be highly resistant while the hybrids GH-1540, GH-1541and line P-8, P-15 showed highly susceptible reaction. This information can be useful for selection of parents and to develop tolerant hybrids in breeding programs or utilize them as source of resistance.

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